| /* |
| * Copyright (c) 2019-2021 Arm Limited. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #ifndef ARM_COMPUTE_MISC_RANDOM_H |
| #define ARM_COMPUTE_MISC_RANDOM_H |
| |
| #include "arm_compute/core/Error.h" |
| #include "utils/Utils.h" |
| |
| #include <random> |
| #include <type_traits> |
| |
| namespace arm_compute |
| { |
| namespace utils |
| { |
| namespace random |
| { |
| /** Uniform distribution within a given number of sub-ranges |
| * |
| * @tparam T Distribution primitive type |
| */ |
| template <typename T> |
| class RangedUniformDistribution |
| { |
| public: |
| static constexpr bool is_fp_16bit = std::is_same<T, half>::value || std::is_same<T, bfloat16>::value; |
| static constexpr bool is_integral = std::is_integral<T>::value && !is_fp_16bit; |
| |
| using fp_dist = typename std::conditional<is_fp_16bit, arm_compute::utils::uniform_real_distribution_16bit<T>, std::uniform_real_distribution<T>>::type; |
| using DT = typename std::conditional<is_integral, std::uniform_int_distribution<T>, fp_dist>::type; |
| using result_type = T; |
| using range_pair = std::pair<result_type, result_type>; |
| |
| /** Constructor |
| * |
| * @param[in] low lowest value in the range (inclusive) |
| * @param[in] high highest value in the range (inclusive for uniform_int_distribution, exclusive for uniform_real_distribution) |
| * @param[in] exclude_ranges Ranges to exclude from the generator |
| */ |
| RangedUniformDistribution(result_type low, result_type high, const std::vector<range_pair> &exclude_ranges) |
| : _distributions(), _selector() |
| { |
| result_type clow = low; |
| for(const auto &erange : exclude_ranges) |
| { |
| result_type epsilon = is_integral ? result_type(1) : result_type(std::numeric_limits<T>::epsilon()); |
| |
| ARM_COMPUTE_ERROR_ON(clow > erange.first || clow >= erange.second); |
| |
| _distributions.emplace_back(DT(clow, erange.first - epsilon)); |
| clow = erange.second + epsilon; |
| } |
| ARM_COMPUTE_ERROR_ON(clow > high); |
| _distributions.emplace_back(DT(clow, high)); |
| _selector = std::uniform_int_distribution<uint32_t>(0, _distributions.size() - 1); |
| } |
| /** Generate random number |
| * |
| * @tparam URNG Random number generator object type |
| * |
| * @param[in] g A uniform random number generator object, used as the source of randomness. |
| * |
| * @return A new random number. |
| */ |
| template <class URNG> |
| result_type operator()(URNG &g) |
| { |
| unsigned int rand_select = _selector(g); |
| return _distributions[rand_select](g); |
| } |
| |
| private: |
| std::vector<DT> _distributions; |
| std::uniform_int_distribution<uint32_t> _selector; |
| }; |
| } // namespace random |
| } // namespace utils |
| } // namespace arm_compute |
| #endif /* ARM_COMPUTE_MISC_RANDOM_H */ |